// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_
#define CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_

#include <memory>
#include <string>

#include "base/callback.h"
#include "base/macros.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/public/platform/WebURLResponse.h"

class GURL;

namespace blink {
class WebFrame;
}

namespace content {

class AssociatedResourceFetcher;

// Helper class to download a Web Manifest. When an instance is created, the
// caller need to call Start() and wait for the passed callback to be executed.
// If the fetch fails, the callback will be called with two empty objects.
class CONTENT_EXPORT ManifestFetcher {
public:
    // This will be called asynchronously after the URL has been fetched,
    // successfully or not.  If there is a failure, response and data will both be
    // empty.  |response| and |data| are both valid until the URLFetcher instance
    // is destroyed.
    typedef base::Callback<void(const blink::WebURLResponse& response,
        const std::string& data)>
        Callback;

    explicit ManifestFetcher(const GURL& url);
    virtual ~ManifestFetcher();

    void Start(blink::WebFrame* frame,
        bool use_credentials,
        const Callback& callback);
    void Cancel();

private:
    void OnLoadComplete(const blink::WebURLResponse& response,
        const std::string& data);

    bool completed_;
    Callback callback_;
    std::unique_ptr<AssociatedResourceFetcher> fetcher_;

    DISALLOW_COPY_AND_ASSIGN(ManifestFetcher);
};

} // namespace content

#endif // CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_
